|Year|Title|B-side|Mediums|Label (Catalog)|
|---|---|---|---|---|
|1996|"Broke"|"Whenever I Breathe Out, You Breathe In" (Positive/Negative)|7"|Sub Pop (SP0338)|
|1997|"A Life of Arctic Sounds"|"Medication"|7"|Suicide Squeeze (SSR001003)|
|1997|"Birds vs. Worms"|"Every Penny Fed Car", "Four Fingered Fisherman"|7"|Hit Or Miss|
|1998|"Other People's Lives"|"Grey Ice Water"|7"|Up Records|
|1998|"Never Ending Math Equation"|"Workin' on Leavin' the Livin'"|7"|Sub Pop (SP0436)|
|1998|"Whenever You See Fit"|"Whenever You See Fit (DJ Dynomite D Mix)", "Whenever You See Fit" (Sientific American Mix)|12", CD|Up Records/Suicide Squeeze|
|1999|"Heart Cooks Brain"|"Shit Luck"|7"|Matador Records|
|2004|"Float On"|"I've Got It All (Most)"|7", CD|Epic (076685)|
|2004|"Ocean Breathes Salty"|"Float On (Live Studio)"|CD|Epic|
|2007|"Dashboard"|"King Rat"|7", CD|Epic|
|2007|"Missed the Boat"||Digital|Epic|
|2009|"Satellite Skin"|"Guilty Cocker Spaniels"|7"|Epic|
|2009|"Autumn Beds"|"Whale Song"|7"|Epic|
|2009|"Perpetual Motion Machine"|"History Sticks To Your Feet"|7"|Epic|

Question: how many modest mouse singles start with the letter "b"?
Answer: 2